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OpenStudy (anonymous):
Why is there a different formula for average atomic mass than normal? For example why is the formula (mass)(% abundance) + (mass)(% abundance)/100
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OpenStudy (anonymous):
alright there is a weighted atomic mass, this happens because you might find a isotope more commonly than another isotope.
OpenStudy (anonymous):
So regardless of the type you take the different isotopes and multiply the mass times the abondances add them all together and get the weighted average
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